<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style type="text/css">
    #showImage {
        width: 200px;
        height: 200px;
    }
    
    #showImage img {
        width: 200px;
        height: 200px;
    }
    </style>
</head>

<body>
    <div id="back">
        <input type="file" id="file" name="files" />
        <div id="showImage"></div>
    </div>
    <div>没哟失败哦</div>
    <script src="upload.js"></script>
</body>

</html>